Zero Trust Network Access (ZTNA) Basics
Zero Trust is one of the more widely discussed concepts in network security today. Here's a general, plain-language explanation of what it generally means in practice.
The core idea: never trust by default
Rather than assuming anything inside a network perimeter is automatically trustworthy (the traditional model), Zero Trust generally verifies every access request regardless of where it originates.
Per-application access, not full network access
A traditional VPN commonly grants broad access to an entire network once connected; ZTNA generally grants access to specific applications individually, based on verified identity and device posture.
Continuous verification
Rather than a one-time login check, Zero Trust approaches generally aim to continuously verify identity, device health, and context throughout a session, not just at the initial connection.
Reduced impact if credentials are compromised
Because access is generally scoped to specific applications rather than the whole network, a compromised set of credentials under a Zero Trust model can potentially cause less damage than under a traditional broad-access VPN model.
This is general educational information about the Zero Trust concept broadly, not specific to any one vendor's ZTNA implementation. Approaches and terminology vary somewhat between vendors — check official documentation for how a specific product implements these principles.